Portable electric heater



FIG. 1 is a perspective view taken from the top and rear of a portable electric heater, showing my new design;

FIG. 2 is a perspective view taken from the bottom and front thereof;

FIG. 3 is a perspective view taken from the top and rear of a portable electric heater, showing a second embodiment of my new design; and

FIG. 4 is a perspective view taken from the bottom and front of FIG. 3 thereof. 

The ornamental design for a portable electric heater, as shown and described. 